Submillimeter-wave telescope onboard a sounding rocket

Hiroshi Matsuo; Junji Inatani; Nario Kuno; Keisuke Miyazawa; Kenichi Okumura; Takashi Kasuga; Hiroshi Murakami

doi:10.1117/12.185824

14 September 1994 Submillimeter-wave telescope onboard a sounding rocket

Hiroshi Matsuo, Junji Inatani, Nario Kuno, Keisuke Miyazawa, Kenichi Okumura, Takashi Kasuga, Hiroshi Murakami

Proceedings Volume 2268, Infrared Spaceborne Remote Sensing II; (1994) https://doi.org/10.1117/12.185824
Event: SPIE's 1994 International Symposium on Optics, Imaging, and Instrumentation, 1994, San Diego, CA, United States

Abstract

We have made a submillimeter-wave telescope for a Japanese sounding rocket, S- 520-17, which is dedicated for an observation of cold dust in Orion molecular cloud region. The system is now under test for launch in Jan. 1995. The telescope include an off-axis Gregorian telescope with aperture of 30 cm, focal plane bolometer array, cryogenic cooling system down to 0.3 K, and a star sensor using charge modulation device. A very low emissivity optical arrangement of less than 1% is achieved using pure aluminum mirror, off axis reflector and cold optics. Single moded conical feed horn is effectively coupled with bolometers with efficiency of more than 90%. The focal plane array consists of 12-element bolometers, six for 250 micrometers observation and six for 500 micrometers observation. NEPs of the bolometers are 5 X 10^-17W/√Hz which is read out by AC bridge read-out circuit. Total system gives sensitivities of about 10^-12W/cm² X sr for diffuse objects or 2 Jy for compact objects at 500 micrometers over 100 deg² region with a beam sizes of 10 arcmin. This observation gives unique data on cold dust distribution, which is believed to dominate the dust mass distribution, over Orion Molecular Cloud region.

Citation Download Citation

Hiroshi Matsuo, Junji Inatani, Nario Kuno, Keisuke Miyazawa, Kenichi Okumura, Takashi Kasuga, and Hiroshi Murakami "Submillimeter-wave telescope onboard a sounding rocket", Proc. SPIE 2268, Infrared Spaceborne Remote Sensing II, (14 September 1994); https://doi.org/10.1117/12.185824

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